<?php 
$this->E_D("DROP TABLE IF EXISTS `db_role_user`;");
$this->E_C("CREATE TABLE `db_role_user` (
  `role_id` mediumint(9) unsigned DEFAULT NULL,
  `user_id` char(32) CHARACTER SET utf8 DEFAULT NULL,
  KEY `group_id` (`role_id`),
  KEY `user_id` (`user_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci");
$this->E_D("replace into `db_role_user` values('1','2');");

 ?>